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PM/gxfb: add hook to PM console layer that allows disabling of suspend VT switch

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Prior to suspend, we allocate and switch to a new VT; after suspend, we switch
back to the original VT.  This can be slow, and is completely unnecessary if
the framebuffer we're using can restore video properly.

This adds a hook that allows drivers to select whether or not to do this vt
switch, and changes the gxfb driver to call this hook.  It also adds a module
param to gxfb to allow controlling of the vt switch (defaulting to no switch).

(Note: I'm not convinced that console_sem is the best way to protect this, but
we should probably have some form of locking..)

[[email protected]: build fix]
Signed-off-by: Andres Salomon <[email protected]>
Cc: Jordan Crouse <[email protected]>
Cc: "Antonino A. Daplas" <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andres Salomon 2008-04-28 02:15:03 -07:00 • committed by Linus Torvalds
commit b6f448e99c
4 changed files with 48 additions and 4 deletions
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3
Documentation/fb/gxfb.txt
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@ -45,7 +45,8 @@ Accepted options:
mode_option - specify the video mode. Of the form
<x>x<y>[-<bpp>][@<refresh>]
vram - size of video ram (normally auto-detected)
vt_switch - enable vt switching during suspend/resume. The vt
switch is slow, but harmless.
--
Andres Salomon <[email protected]>